Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.32: Poster

Wednesday, March 22, 2017, 15:00–19:00, P1A

Interferometrically Enhanced Spin Noise Spectroscopy of Rubidium — •Pavel Sterin, Jens Hübner, and Michael Oestreich — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, D-30167 Hannover, Germany

Spin noise spectroscopy is a powerful method for detecting the unaltered spin dynamics in atomic gases and semiconductors [1] since the spin fluctuations in these systems implicitly contain information about the intrinsic spin correlation which can be extracted from the spin noise power spectrum. Transparent samples allow to use the Faraday effect to map these spin fluctuations onto small rotations of a linearly polarized probe laser light. Here, the probe photon energy should be in the vicinity of an optical transition in order to ease the detection of the Faraday rotation. Hence, low probe laser intensities are necessary in order to reduce residual absorption and keep the system at thermal equilibrium [2], however, at the cost of the difficulties connected with low light detection. Recent advancement on high frequency measurements were achieved using a heterodyne setup [3]. Here, we employ a homodyne approach to concentrate on low frequencies, that are not accessible in the heterodyne setup. Conversely, the homodyne setup will allow to amplify the polarization signal, thereby making very low probe laser intensities accessible. A ⁸⁷Rb vapor reference cell will be used as a test system during the development of this experiment.

[1] Hübner et al., phys. stat. sol. B 251, 1824, (2014).

[2] Dahbashi et al., Appl. Phys. Lett. 100, 031906, (2012).

[3] Cronenberger et al., Rev. Sci. Instrum., 87, 093111 (2016).